Please help! Hurry!

Which soil horizon contains bedrock?
A. Horizon A
B. Horizon B
C. Horizon C
D. Horizon D

Which is an example of a population?

How does friction with the atmosphere affect the speed of an artificial satellite

Duchenne muscular dystrophy is a serious condition caused by a recessive allele of a gene on the human x chromosome. the patients have muscles that weaken over time because they have absent or decreased dystrophin, a muscle protein. they rarely live past their twenties. how likely is it for a woman to have this condition? a) women can never have this condition.b) one-fourth of the daughters of an affected man would have this condition.c) one-half of the daughters of an affected father and a carrier mother could have this condition.d) only if a woman is xxx could she have this condition.